Self etch all purpose dental compositions, method of manufacture, and method of use thereof

ABSTRACT

A self-etching and self-adhesive dental composition is provided, comprising a polymerizable (meth)acrylate carboxylic acid/anhydride; a copolymerizable multi-functional (meth)acrylate resin; a copolymerizable diluent monomer; and a curing system. The composition has the advantage of not requiring a separate etching and bonding step.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part application of U.S. patentapplication Ser. No. 11/360,314, filed Feb. 23, 2006, which isincorporated herein by reference in its entirety.

BACKGROUND

This invention relates to dental resin compositions comprisingpolymerizable (meth)acrylate resins, their method of manufacture, andthe use of such resins for restorative dentistry without the need for aseparate etching/bonding step.

Methods and compositions for improving the adhesion of resins to hardtissue, i.e., dentin or enamel, is an ongoing goal in the dental arts.Improved adhesion leads to longer lasting restorations and reduced toothsensitivity. Numerous methods for preparing teeth for the application ofa dental restorative material (such as a sealant, filling material,cementation of indirect dental restorations or the like) haveaccordingly been developed, including acid etch and priming steps.

Acid etchants are commonly used to remove a smear layer and demineralizethe tooth surfaces so as to promote effective mechanical bonding of therestorative material. However, the use of an etchant has a disadvantagein that it must be washed off after application, requiring thetime-consuming procedure of application, washing, and drying. A furtherdisadvantage of etchants is the perception that use of strong etchantscan increase dental sensitivity in some patients.

In addition to acid etch procedures, adhesive strength is also improvedby use of a primer. Primers are generally surface-active compounds thatexhibit both an affinity for dentin and adhesive resin systems andparticipate in the polymerization process, thereby promoting adhesionbetween the primarily hydrophilic dentin and the predominantlyhydrophobic polymeric adhesives or monomers from which they are formed.Primers are applied to dentin in solution form, commonly used solventsincluding acetone, ethanol, water, and various mixed solvent systems.While effective for promoting bonding, primers however are often appliedusing an additional step.

Current resin cement materials used for the cementation of dentalrestorations made from metal alloy, ceramic/porcelain, or compositematerial require a separate bonding procedure to ensure sufficient andeffective bonding of the dental restoration to the tooth. Often aseparate procedure including etching and applying a bonding adhesive tothe tooth or restoration is required, rendering the cementationprocedure time consuming and more complex.

Conventional luting cements such as glass ionomer cement, zinc phosphatecement, and polycarboxylate cement are typically used for cementingmetal restorations without a separate bonding step. However, the lutingcements are not suitable for cementing composite or ceramicrestorations. Additionally, the bonding ability of the luting cements totooth structure is poor.

There accordingly remains a need in the art for improved dental cementmaterials and other dental compositions providing improved adhesion to atooth surface and a dental substrate, and yet which can be applied in afewer number of steps.

SUMMARY

The above-described drawbacks and disadvantages are alleviated by aself-etching and bonding dental resin cement composition comprising apolymerizable (meth)acrylate carboxylic acid/anhydride; acopolymerizable multi-functional (meth)acrylate; a diluent; a filler;and a curing system. These cement compositions can be prepared as atwo-paste system that is combined prior to use.

Specifically, in one embodiment, a self-etching and bonding dental resincement composition comprises a two paste system that is combined priorto use, wherein a first paste comprises about 40 to about 80 weightpercent of a polymerizable (meth)acrylate carboxylic acid/anhydridebased on the total weight of the first paste polymerizable material; afirst copolymerizable multi-functional (meth)acrylate; a firstcopolymerizable diluent; a first filler; and a peroxide curing system;wherein a second paste comprises a second copolymerizablemulti-functional (meth)acrylate; a second copolymerizable diluent; asecond filler; optionally a second polymerizable (meth)acrylatecarboxylic acid/anhydride; and optionally a photoinitiator.

In another specific embodiment, a one-part self-etching and bondingdental resin cement composition comprises, in combination about 20 toabout 60 weight percent of a first polymerizable (meth)acrylatecarboxylic acid/anhydride; a copolymerizable multi-functional(meth)acrylate resin; a copolymerizable diluent monomer; and a curingsystem.

The self-etching and bonding dental resin cement compositions provideseven further advantages over the art, as all etching and bonding can beperformed in one step without the need for the use of an etchant or aseparate bonding adhesive. Furthermore, the self-etching and bondingdental resin cement composition can be both self-curable and lightcurable.

In accordance with the method of use, the self-etching and bondingdental resin cement composition is physically contacted with the toothstructure or a tooth restoration, the tooth restoration is then adheredto the tooth surface, and the cement composition is allowed to cure.

DETAILED DESCRIPTION

Described herein are self-etching and bonding dental resin cementcompositions that will, in one operation, etch the tooth surface, i.e.remove dentin smear and etch/dissolve calcium minerals from the surfaceof the tooth structure, and bond a tooth restoration to the tooth. Asthe cement composition is self-etching and bonding, the resin cementcoating forms a reliable bond with the tooth structure and a toothrestoration. The composition can accordingly be used withoutintermediate adhesion steps.

The compositions can be one-part or two-part compositions. Specifically,a self-etching and bonding dental resin cement composition comprises atwo paste system that is combined prior to use, wherein a first pastecomprises about 40 to about 80 weight percent of a polymerizable(meth)acrylate carboxylic acid/anhydride based on the total weight ofthe first paste polymerizable material; a first copolymerizablemulti-functional (meth)acrylate; a first copolymerizable diluent; afirst filler; and a peroxide curing system; wherein a second pastecomprises a second copolymerizable multi-functional (meth)acrylate; asecond copolymerizable diluent; a second filler; optionally aphotoinitiator; and optionally a second polymerizable (meth)acrylatecarboxylic acid/anhydride.

The polymerizable (meth)acrylate carboxylic acid/anhydride can have thegeneral structure (I):

In structure (I), n is 0, 1, 2, 3, or 4; q is 1, 2, 3, or 4; A is ananhydride group; and a is 0 or 1, with the proviso that a and n are notboth 0 at the same time. As is known, the anhydride group(—C(O)—O—C(O)—) is linked via its two carbon atoms to two ortho carbonsof the phenyl ring. Further in structure (I), R¹, R², R³, and R⁴ areeach independently hydrogen, hydroxy, C₁-C₁₂ alkyl, C₁-C₁₂ perhaloalkyl,C₁-C₁₂ alkoxy, C₁-C₁₂ perhaloalkoxy, C₂-C₁₂ alkenyl, C₂-C₁₂ alkynyl,(C₁-C₆ alkyl)-O—(C₁-C₆ allylene), or hydroxy(C₁-C₆ allylene), wherein xand y are each independently an integer from 1 to 10. In one embodiment,R¹, R², R³, and R⁴ are each independently hydrogen, hydroxy, or C₁-C₁₂allyl, and x and y is each independently an integer from 1 to 6. Morespecifically, R¹, R², R³, and R⁴ is each independently hydrogen or C₁-C₆alkyl.

R⁵ in structure (I) is a hydrogen or methyl group, and specificallymethyl group.

M in structure (I) is a carbonyl-containing group, in particular

wherein G and J are each independently oxygen or NR⁶, wherein R⁶ ishydrogen or C₁-C₆ alkyl; and m is 0, 1, or 2. Specifically, M is

wherein G is oxygen, and m is 0 or 1.

W in structure (I) is a hydrocarbyl linking group having a valencycorresponding to z, the number of (meth)acrylate groups, plus one;specifically z is 1, 2, 3, 4, or 5. W may be aromatic or aliphatic,specifically aliphatic. Suitable aromatic groups are phenyl and napthyl,and suitable aliphatic groups are C₁-C₁₂ alkyl, cycloalkyl, alkenyl, oralkynyl groups.

In structure (I), when a is 0, n is 1, 2, 3, or 4 and n+m+q is 2, 3, 4,5, or 6. When a is 1, n is 0, 1, 2, or 3, and n+m+q is 1, 2, 3, or 4.When n is 0, a is 1, and m+q is 1, 2, 3, or 4.

In one embodiment, polymerizable (meth)acrylate carboxylicacid/anhydride has the general structure according to structure (I),wherein a is 0 or 1; n is 0, 1, or 2; m is 0 or 1; q is 1 or 2; A is ananhydride group; R¹, R², R³, and R⁴ are each independently hydrogen,hydroxy, or C₁-C₁₂ alkyl; x and y is each independently an integer 1, 2;or 3; R⁵ is a hydrogen or methyl group; M is a carbonyl-containinggroup, in particular

wherein G and J are each independently oxygen or NR⁶, wherein R⁶ ishydrogen or C₁-C₆ allyl; W is an aliphatic hydrocarbyl linking grouphaving a valency corresponding to z, the number of (meth)acrylategroups, plus one; specifically z is 1, 2, or 3; with the proviso thatboth a and n are not both 0.

In another embodiment, the polymerizable (meth)acrylate carboxylicacid/anhydride has the general structure according to structure (II):

In structure (II), n is 0, 1, 2, 3, or 4; A is an anhydride group; a is0 or 1; and R⁵ is hydrogen or methyl, with the proviso that a and n arenot both 0 at the same time. p is 1, 2, 3, or 4, specifically 1, 2, or3, and more specifically 1 or 2. R⁷ and R⁸ are each independentlyhydrogen, hydroxy, C₁-C₁₂ allyl, C₁-C₁₂ perhaloalkyl, C₁-C₁₂ alkoxy,C₁-C₁₂ perhaloalkoxy, C₂-C₁₂ alkenyl, C₂-C₁₂ alkynyl, (C₁-C₆alkyl)-O—(C₁-C₆ allylene), or hydroxy(C₁-C₆ alkylene), specifically R⁷and R⁸ are each independently hydrogen, hydroxy, or C₁-C₁₂ alkyl, morespecifically R⁷ and R⁸ are each independently hydrogen, hydroxy, C₁-C₆alkyl. d is an integer of 1 to 10, specifically 1, 2, 3, 4, or 5, andmore specifically 1, 2, or 3.

In structure (II), when a is 0, n is 1, 2, 3, or 4. When a is 1, n is 0,1, 2, or 3. When n is 0, a is 1.

In one embodiment, for structure (II) n is 0, 1, 2, or 3; A is ananhydride group; a is 0 or 1; R5 is hydrogen or methyl; p is 1, 2, or 3;R7 and R8 are each independently hydrogen, hydroxy, or C1-C12 allyl; dis 1, 2, 3, 4, or 5; and with the proviso that a and n are not both 0.

Exemplary polymerizable (meth)acrylate carboxylic acid/anhydridesencompassed by the structure (I) include1,4-di(meth)acryloyloxyethylpyromellitic acid;4-(meth)acryloyloxymethyltrimellitic acid and the anhydride thereof;4-methacryloyloxyethyltrimellitic acid (4-MET) and an anhydride thereof(4-META); 4-acryloyloxyethyltrimellitic acid and an anhydride thereof;4-(2-hydroxy-3-(meth)acryloyloxy)butyltrimellitic acid and an anhydridethereof; an adduct of 2-hydroxyethyl methacrylate (HEMA) withpyromellitic dianhydride (PMDM); an adduct of 2-hydroxyethyl acrylatewith pyromellitic dianhydride; the reaction product of HEMA withethylene glycol bistrimellitate dianhydride (EDMT); the adduct ofpyromellitic dianhydride with glycerol dimethacrylate (PMGDM); or acombination comprising at least one of the foregoing.

The polymerizable (meth)acrylate (I) may be synthesized, for example,from the reaction of a hydroxy-containing (meth)acrylate monomer and anaromatic compound comprising anhydride or carboxylic acid functionalityor their synthetic equivalents (e.g., a carboxylic acid halide, forexample chloride). Exemplary synthetic methods are described in U.S.Published Application, 2005/0192374A1 incorporated herein by referencein its entirety.

The polymerizable (meth)acrylate carboxylic acid/anhydride is present inthe first paste at about 40 to about 80 weight percent, specificallyabout 45 to about 70 weight percent, more specifically about 50 to about65 weight percent, and still yet more specifically about 55 to about 60weight percent based on the total weight of the first pastepolymerizable material. As used herein, “polymerizable material”includes any compound that can copolymerize with the (meth)acrylatefunctionality of the polymerizable (meth)acrylate carboxylicacid/anhydride, such as compounds comprising ethylenically unsaturatedgroups, for example, the copolymerizable multi-functional(meth)acrylates, the diluents, co-polymerizable adhesion promoter, andthe like. As used herein, the term “(meth)acrylate” is intended toencompass both acrylate and methacrylate groups.

Optionally, the polymerizable (meth)acrylate carboxylic acid/anhydridemay also be present in the second paste in an amount of about 1 to about40 weight percent, specifically about 2 to about 30 weight percent, morespecifically about 3 to about 20 weight percent, and still yet morespecifically about 4 to about 10 weight percent based on the totalweight of the second paste polymerizable material.

The self-etching and bonding dental resin composition further comprisesa copolymerizable multi-functional (meth)acrylate resin present in thefirst and second paste systems. The copolymerizable multi-functional(meth)acrylate may be monomeric, oligomeric, or polymeric, and has a(meth)acrylate functionality that is copolymerizable with thepolymerizable (meth)acrylate carboxylic acid/anhydride, specifically twoor more (meth)acrylate functionalities. The copolymerizablemulti-functional (meth)acrylates differ from the diluent monomers asthey are viscous resins, and include, for example, urethane(meth)acrylates, including urethane dimethacrylate (UDMA); polyurethane(meth)acrylates, including polyurethane dimethacrylate (PUDMA);diurethane dimethacrylates, including diurethane di(meth)acrylate(DUDMA); polycarbonate di(meth)acrylates, including the polycarbonatedimethacrylate (PCDMA) disclosed in U.S. Pat. Nos. 5,276,068 and5,444,104 to Waknine, which is the condensation product of two parts ofa hydroxyalkylmethacrylate and 1 part of a bis(chloroformate);ethoxylated bisphenol A di(meth)acrylates including ethoxylatedbisphenol A dimethacrylate (EBPDMA) as disclosed in U.S. Pat. No.6,013,694 to Jia, et al.; ethoxylated trimethylolpropanetri(meth)acrylates, specifically having about 10 to about 30 ethoxygroups; the diglycidyl(meth)acrylate adducts of Bisphenol A, including2,2′-bis[4-(3-methacryloxy-2-hydroxy propoxy)-phenyl]-propane (BisGMA);or a combination comprising at least one of the foregoing. Such viscousresins have a viscosity of greater than 0.1 Pa-second, more typicallygreater than about 1 Pa-second, at 23° C. Either or both of the pastescan contain more than one type of multi-functional (meth)acrylate. Thesame or different multi-functional (meth)acrylates can be used the firstand second pastes.

The total amount of first copolymerizable multi-functional(meth)acrylate present in the first paste can be about 0.01 to about 30weight percent, specifically about 1 to about 25 weight percent, andmore specifically about 5 to about 20 weight percent based on the totalweight of the first paste polymerizable material.

The total amount of second copolymerizable multi-functional(meth)acrylate present in the second paste can be about 20 to about 95weight percent, specifically about 50 to about 90 weight percent, andmore specifically about 65 to about 80 weight percent based on the totalweight of the second paste polymerizable material.

The self-etching and bonding dental resin composition further comprisesa copolymerizable diluent monomer in the first and second paste. Diluentmonomers may be used to increase the surface wettability of thecomposition and/or to decrease the viscosity of the polymerizationmedium. Suitable diluent monomers include, for example hydroxyalkyl(meth)acrylates, for example 2-hydroxyethyl(meth)acrylate,2-hydroxypropyl(meth)acrylate, and 4-hydroxybutyl(meth)acrylate,specifically HEMA; ethylene glycol mono- and di(meth)acrylates,including ethylene glycol (meth)acrylate, diethylene glycol(meth)acrylate, tri(ethylene glycol) di(meth)acrylate, specificallytri(ethylene glycol) dimethacrylate (TEGDMA), and tetra(ethylene glycol)di(meth)acrylate; propylene glycol mono- and di(meth)acrylates, both1,2- and 1,3-, including propylene glycol (meth)acrylate, dipropyleneglycol (meth)acrylate, tri(propylene glycol) di(meth)acrylate, andtetra(propylene glycol) di(meth)acrylate; diol di(meth)acrylates such as1,4-butanediol di(meth)acrylate, dodecane diol di(meth)acrylate, and1,6-hexanediol di(meth)acrylate; glycerol mono- and di(meth)acrylates;trimethylolpropane mono-, di, and tri(meth)acrylates; pentaerythritolmono-, di, and tri(meth)acrylates; phenyl glycidyl ether (meth)acrylate;or a combination comprising at least one of the foregoing. Such diluentresins have a viscosity of less than 0.1 Pa-second, more typically lessthan about 0.05 Pa-second, at 23° C. Either or both pastes can compriseone or more different types of diluent monomers. The same or differentdiluent monomers can be used the first and second pastes.

The total amount of first diluent in the first paste can be about 1 toabout 60 weight percent, specifically about 5 to about 50 weightpercent, and more specifically about 10 to about 40 weight percent basedon the total weight of the first paste polymerizable material.

The total amount of second diluent in the second paste can be about 5 toabout 50 weight percent, specifically about 10 to about 40 weightpercent, and more specifically about 20 to about 30 weight percent basedon the total weight of the second paste polymerizable material.

The self-etching and bonding dental resin composition may furtheroptionally comprise a co-polymerizable adhesion promoter, for example anolefinically unsaturated monomer resin containing a phosphoryl group.Exemplary copolymerizable adhesion promoters includedipentaerythritol-pentaacrylate-phosphoric acid ester (PENTA);bis(2-ethylhexyl)hydrogen phosphate; 2-(methacryloyloxy)-ethylphosphate; or a combination comprising at least one of the foregoingadhesion promoters.

The self-etching and bonding dental resin composition further contains acuring system, which generally can include polymerization initiators;polymerization accelerators; ultraviolet light absorbers; antioxidants;and/or other additives known in the art depending upon whether thecement composition is formulated for self-cure or dual-cure.

The self-cure composition can be cured without the use of radiationactivation. Such curing systems typically include a free radicalpolymerization initiator such as, for example, a peroxide in an amountof about 0.1 to about 5.0 parts per hundred based on the total of thepolymerizable materials of the first or second paste. Exemplary freeradical polymerization initiators are lauryl peroxide, tributylhydroperoxide, and benzoyl peroxide (BPO).

The dual-cure system is both self-cure and radiation cure, for example,the self-etching and bonding dental resin composition is actinic lightcurable, specifically ultraviolet (UV) or visible light. Suitable freeradical polymerization initiators for visible light-curable compositionsemploy light-sensitive compounds, including for example, benzil,benzoin, benzoin methyl ether, DL-camphorquinone (CQ), and benzildiketones. Suitable commercially available phosphine oxidephotoinitiators include, for example, the LUCIRIN™ series from BASFCorp. such as LUCIRIN™ TPO (L-TPO) and LUCIRIN™ 8809. Other phosphineoxide photoinitiators may be selected from the DAROCUR™ or IRGACURE™series from Ciba-Geigy Corp. Examples include DAROCUR™ TPO, DAROCUR™4265, IRGACURE™ 1800, and the like. Either UV-activated cure or visiblelight-activated cure (approximately 230 to 750 nanometer) is acceptable.The amount of photoinitiator is selected according to the curing ratedesired. A minimal catalytically effective amount is generally about0.01 weight percent of the total self-etching and bonding dental resincement composition, and will lead to a slower cure. Faster rates of cureare achieved with amounts of catalyst in the range from greater thanabout 0.1 to about 5 parts per hundred based on the total of thepolymerizable materials of the first or second paste.

Optionally, an ultraviolet absorber can be used in the curing system inan amount of about 0.05 to about 5.0 parts per hundred based on thetotal of the polymerizable materials of the first or second paste. SuchUV absorbers are useful in the visible light-curable dental restorativematerials in order to avoid discoloration of the resin from incidentultraviolet light. Suitable UV absorbers are the various benzophenones,particularly UV-5411 available from American Cyanamid Company.

Free radical-type polymerization accelerators suitable for use in thecuring system include the various organic tertiary amines well known inthe art. In visible light-curable compositions, the tertiary amines aregenerally (meth)acrylate derivatives such as dimethylaminoethylmethacrylate and, specifically, diethylaminoethyl methacrylate (DEAEMA)or tertiary aromatic amines such as ethyl 4-(dimethylamino)benzoate(EDMAB) in an amount of about 0.5 to about 5.0 parts per hundred basedon the total of the polymerizable materials of the first or secondpaste. In the self-curing compositions, the tertiary amines aregenerally aromatic tertiary amines, specifically tertiary aromaticamines such as EDMAB, 2-[4-(dimethylamino)phenyl]ethanol,N,N-dimethyl-p-toluidine (DMPT), and bis(hydroxyethyl)-p-toluidine(DHEPT). Other exemplary accelerators include aromatic sulfinic acidsalts, for example benzenesulfonic acid, sodium salt (BSA.Na). Suchaccelerators are generally present in an amount of about 0.5 to about4.0 parts per hundred based on the total of the polymerizable materialsof the first or second paste.

The self-etching and bonding dental resin composition further comprisesa filler system comprising one or more of the inorganic fillers suitablefor use in dental composite materials. Examples of suitable fillingmaterials include but are not limited to, silica including fumed silica,quartz, strontium silicate, strontium borosilicate, lithium silicate,lithium alumina silicate, amorphous silica, ammoniated or deammoniatedcalcium phosphate, tricalcium phosphate alumina, zirconia, tin oxide,titania, barium borosilicate glass filler, glass ionomer filler (e.g.Ca—Al—F—Ba-Silicate) and a combination comprising at least one of theforegoing fillers. Some of the aforementioned inorganic fillingmaterials and methods of preparation thereof are known in the art, asdisclosed in U.S. Pat. No. 4,544,359 and No. 4,547,531 to Waknine,pertinent portions of which are incorporated herein by reference.Organic-inorganic fillers of POSS™ (Hybrid Plastics) can be incorporatedinto the composites as disclosed in U.S. Patent Application Publication2002/0198282 A1. Other organic-inorganic fillers such as zirconiummethacrylate and zirconium dimethacrylate available under the codes ofCXZR050 and CXZR051 (Gelest, Inc.) can also be used. Suitable highrefractive index filler materials such as high refractive index silicaglass fillers; calcium silicate based fillers such as apatites,hydroxyapatites or modified hydroxyapatite compositions may also beused. Alternatively, inert, non-toxic radiopaque materials such asbismuth oxide (Bi₂O₃), bismuth oxychloride (BiOCl), zirconium oxide,barium sulfate, and bismuth subcarbonate in micro- or nanoscaled sizesmay be used. In addition, fibrous fillers such as those disclosed inU.S. Pat. Nos. 6,013,694, 6,403,676 and 6,270,562 to Jia and Jia et al.may also be used.

Suitable fillers have particle sizes of about 0.01 to about 5.0micrometers, and may further comprise bound or unbound silicate colloidsof about 0.001 to about 0.2 micrometers. These additional fillers mayalso be treated with a silane-coupling agent to increase adhesion withthe polymerizable (meth)acrylate. Commercially available silane treatedfumed silica based on Aerosil A200 can be obtained from Degussa Corpunder the names of Aerosil R711 and R7200.

The amount of total filler system in the self-etching and bonding dentalresin composition can vary from about 30 to about 80 weight percentbased on the total weight of the resin cement composition, specificallyabout 40 to about 70 weight, and more specifically about 50 to about 65weight percent filler based on the total self-etching and bonding dentalresin cement composition.

The amount of filler system in the first paste can be about 1 to about80 weight percent based on the total weight of the composition,specifically about 20 to about 60 weight percent, and more specificallyabout 30 to about 50 weight percent based on the total weight of thecomposition. The amount of filler system in the second paste can beabout 1 to about 80 weight percent based on the total weight of thecomposition, specifically about 20 to about 60 weight percent, and morespecifically about 30 to about 50 weight percent based on the totalweight of the composition.

Any of the present compositions may further include additional additivessuch as stabilizers (e.g. 3,5-di-tert-butyl-4-hydroxytoluene (BHT)),flavoring agents, disinfectants/medicates, color indicators, pHindicators, a fluoride source, tooth mineralization promoting agent andthe like Suitable fluoride sources include, for example, sodiumfluoride, stannous fluoride, sodium monofluorophosphate, calciumfluorophosphate, and the like. When present, fluoride-releasingcompounds, excluding the glass ionomer filler, are used in quantities ofup to about 2% by weight of the total self-etching and bonding dentalresin cement composition.

Where the composition is formulated as a two-paste system, the twopastes are formulated, provided self-etching and bonding dental resincomposition to the practitioner, and combined just prior to use. Thefirst paste can contain a polymerizable (meth)acrylate carboxylicacid/anhydride, a copolymerizable multi-functional (meth)acrylate, adiluent, a filler, and a free radical polymerization initiator; and thesecond paste can contain a copolymerizable multi-functional(meth)acrylate, a diluent, a filler, optionally a polymerizable(meth)acrylate carboxylic acid/anhydride, and optionally a free radicalpolymerization initiator for visible/ultraviolet light polymerization.Each paste may further optionally comprise a stabilizer, afree-radical-type polymerization accelerator, and/or a UV absorber aslong as the stability of the resulting individual paste is notcompromised. The filler may include radiopaque materials and highrefractive index fillers as described above.

When necessary, desired amounts of the two pastes are metered out andthen mixed using a spatula or other appropriate blending equipment. Theself-etching and bonding dental resin composition thus obtained is thenplaced in the tooth to be restored.

In another embodiment, the self-etching and bonding dental resincomposition is provided to the practitioner as a one-part composition. Aone-part composition comprises, based on the polymerizable materials,about 20 to about 60 weight percent of a polymerizable (meth)acrylatecarboxylic acid/anhydride; a copolymerizable multi-functional(meth)acrylate resin; a copolymerizable diluent monomer; and a curingsystem. Each of the foregoing components is described above inconnection with the two-part system. In addition, a particulate fillercan be present, as is also described above in connection with thetwo-part composition.

In a specific embodiment, the one-part self-etching and bonding dentalresin composition comprises about 20 to about 60 weight percent,specifically about 30 to about 55, and even more specifically about 32to about 44 weight percent of the polymerizable (meth)acrylatecarboxylic acid/anhydride; about 10 to about 50 weight percent,specifically about 12 to about 45 weight percent of a copolymerizablemulti-functional (meth)acrylate resin; and about 15 to about 55 weightpercent, specifically about 20 to about 50 weight percent of acopolymerizable diluent monomer. Each of the foregoing amounts is basedon the total weight of the polymerizable components. When a particulatefiller is present, the composition comprises about 10 to about 90,specifically about 20 to about 75, more specifically about 30 to about75 weight percent filler, based on the total weight of the composition.

The one-part self-etching and bonding dental resin composition isgenerally formulated by mixing a polymerizable (meth)acrylate carboxylicacid/anhydride, the copolymerizable multi-functional (meth)acrylates;the diluents; filler; and a curing system. The self-etching and bondingdental resin cement composition can then applied to the tooth to berepaired, and cured.

Use of the one- and two-part self-etching and bonding dental resincomposition includes applying the self-etching and bonding dental resincomposition as a cement or luting agent to the tooth or the internalsurface of a dental restoration being bonded, adhering the restorationonto the tooth surface, and allowing the cement composition to cure. Theself-etching and bonding dental resin cement composition can beself-curable or light curable. The cure may be initiated through the useof actinic radiation, by raising the temperature of the mixture, or bysimply waiting for the chemical self-cure. Specifically, theself-etching and bonding dental resin composition is actinic lightcurable, specifically visible light. A separate etching step or bondingstep (e.g., application of a polymerizable dental adhesive system) neednot be performed. The dental resin bonds to the tooth without the needfor the tooth to be washed.

Useful dental restorative materials or cements that may be used togetherwith the self-etching and bonding dental resin compositions includeamalgam and non-amalgam dental restoratives. Examples of usefulnon-amalgam materials include composite resin restoratives, metal andmetal alloy restoratives, ceramic/porcelain restorative, and the like.Suitable dental restoratives are those conventional in the art.

Besides a dental cement, the self-etching and bonding resin compositioncan also be used as a bonding agent, a base lining material underneath adental restoration, a tooth surface pit and fissure sealing material, atooth filling restorative material, a post and core build-up material, aroot canal sealing material, and in other dental treatment andrestorative applications.

The compositions can be applied using various techniques. In general, ifthe viscosity of the composition is relatively low, for example,containing no filler or small amounts of filler, then the material canbe applied on to a tooth with a brush; if the viscosity of thecomposition is relatively high, then the material can be applied ordispensed onto a tooth surface with a cannular needle tip, like aflowable composite as described in U.S. Pat. No. 6,767,955 to Jia.

The self-etching and bonding dental resin composition when applied to atooth enhances the adhesiveness of the tooth without the need for anetching or bonding step. The multi-step bonding protocols typical ofcurrent commercial resin cement systems generally tend to be a source ofmaterial waste and unreasonable technique sensitivity. The presentself-etching and bonding dental resin composition not only reduce thenumber of steps normally involved in preparing a substrate surface andapplying the dental restorative materials, but less waste and improvedrestorative or sealant results are obtained.

Furthermore, although conventional aggressive etchants are effective incleaning the surface of dentin for improved wetting, they can alsoweaken the underlying sound dentin by excessive demineralization anddisruption of collagen fibrils. These types of etchants typicallyrequire an aqueous rinse step to remove residual acid and solubleby-products. Also, the depth of demineralized, altered dentin resultingfrom the use of aggressive etchants may exceed the depth to which anadhesive resin can penetrate the dentin, resulting in a weakened,partially reinforced hybrid dentin zone, and thereby become vulnerableto failure. In contrast, the present compositions do not require the useof these etchants and are used as single step composition.

In one embodiment, the self-etching and bonding dental resin compositionis substantially free of added water. As used herein “substantially freeof added water” means that no water is purposely added to the cementcompositions and excludes water present in the starting materials orabsorbed from the surrounding environment.

Contemplated herein are prepackaged dual-syringe or dual-barrelcartridges containing the self-etching and bonding dental resincomposition in the form of a two-paste system. Each paste is packagedcontaining a catalyst paste in one cartridge or syringe and a base pastein the other cartridge or syringe. The two pastes remain separated untiluse, each paste can be dispensed in the desired amounts, typically equalamounts, mixed together and applied. The prepackaged cartridges mayfurther comprise printed instructions, guidelines or tips for mixing,dispensing, or measuring the components; and/or guidelines for use.

The following non-limiting examples illustrate the invention.

EXAMPLES

Materials used for the following examples include are set forth in theTable A below. TABLE A Material Description 4-MET/4-META4-Methacryloyloxyethyltrimellitic anhydride from Polyscience, Inc. PABisGMA 2,2′-Bis[4-(3-methacryloxy-2-hydroxy propoxy)- phenyl]-propaneUDMA Urethane dimethacrylate HEMA 2-Hydroxyethyl methacrylate TEGDMATri(ethylene glycol) dimethacrylate BPO Benzoyl peroxide DHEPTBis(hydroxyethyl)-p-toluidine EDMAB Ethyl 4-(dimethylamino)benzoateLucirin-TPO Phosphine oxide photoinitiator from BASF Corp. UV-5411Benzophenone UV absorber from American Cyanamid Company BHT3,5-Di-tert-butyl-4-hydroxytoluene BSA•Na Benzenesulfinic acid sodiumsalt CQ DL-camphorquinone BiOCl Bismuth oxychloride B467 Silane treatedbarium borosilicate glass filler Glass ionomer filler Surface activeCa—F—Al—Ba-silicate glass filler Fumed silica Amorphous/fumed silicafiller R7200 Silane treated silica filler

Example 1 Self-Etching and Bonding Dental Resin Cement CompositionContaining 4-methacryloyloxyethyltrimellitic Acid/Anhydride

In this example, a self-etching and bonding dental resin cementcomposition was prepared from 4-META, BisGMA, HEMA, UDMA, and TEGDMAaccording to the formulas of Table 1. As set forth in the Table, theexample is a self-etching and bonding dental resin cement compositionprepared from two-paste system, a catalyst paste and a base paste. Foruse as a dental cement, the working time and setting time of thecomposition is about three minutes and four and half minutes,respectively, when the base paste and catalyst paste are mixed in 1:1ratio by volume and the material is not subject to a second curingprocess. In dual-cure mode, when the material, upon mixing the basepaste and catalyst paste, is subject to a dental visible light-curingsource, the mass of the material will harden immediately upon thephotoinitiation. TABLE 1 Resin compositions used to Catalyst resin: formcatalyst and base pastes BPO 2.75 wt %, BHT 0.2 wt % in4-META/BisGMA/HEMA (Weight ratio: 60/10/30) Base resin: UV-5411 1.2 wt%, L-TPO 0.25 wt %, DHEPT 0.5 wt %, EDMAB 0.4 wt %, CQ 0.2 wt % inUDMA/TEGDMA (Weight ratio: 70/30) Paste Components Catalyst paste:Catalyst resin/Ba-b-silicate glass filler/BiOCl/fumed silica (WeightRatio: 45/56.5/1/0.5) Base paste: Base resin: 32 wt % Filler: 68 wt %total of T530, Ba-b-silicate glass filler, glass ionomer filler, andBSA•Na

Examples 2-6 Self-Etching and Bonding Dental Resin Cement CompositionContaining 4-methacryloyloxyethyltrimellitic Acid/Anhydride

In Examples 2-6 self-etching and bonding dental resin cementcompositions were prepared from 4-MET/4-META, BisGMA, HEMA, UDMA, andTEGDMA. Base resin and catalyst resin formulations are provided in Table2 (all components are in parts per hundred). TABLE 2 Example 2 Example 3Example 4 Example 5 Example 6 Component Base Catalyst Base Catalyst BaseCatalyst Base Catalyst Base Catalyst 4-MET/4-META — 60 — 60 — 60 — 50 —50 BisGMA 70 10 — 10 — — — — — 10 UDMA — — 70 — 70 15 70 20 70 — HEMA 3030 — — 30 25 — 30 — — TEGDMA — — 30 30 — — 30 — 30 40 EDMAB 0.4 — 0.2 —0.4 — 0.2 — 0.5 — BPO — 2.75 — 2.75 — 2.75 — 2.75 — 2.75 DHEPT 0.5 — 0.8— 0.5 — 0.6 — 0.8 — Lucirin-TPO 0.25 — 0.25 — 0.25 — 0.25 — 0.25 —UV-5411 1.2 — 1.2 — 1.2 — 1.2 — 1.2 — BHT — 0.2 — 0.2 — 0.2 — 0.2 — 0.2BSA•Na 2.0 — 1.0 — 1.0 — 1.8 — 1.5 — CQ 0.1 — — — 0.1 — — — 0.1 —

Self-etching and bonding dental resin cement compositions Examples 2-6were prepared by compounding fillers according to Table 3 with thecatalyst resins and base resins provided in Table 2 (all components arein parts per hundred). The base pastes and resin pastes of Examples 2-6have similar viscosities and can be dispensed through a dual-barrelcartridge equally and mixed homogenously.

Table 3 further shows the results of testing the shear bonding strength(SBS) of the self-etching and bonding dental resin cement compositionsof Examples 2-6 between dentin and a ceramic (3G® ceramic material,Pentron Corp., Wallingford, Conn.). The bonding test method was asfollows:

-   -   1. 3G® ceramic rods were fabricated with a dental porcelain        furnace according to the ceramic firing temperature and        conditions of the product. The 3G® ceramic rods used for the        bonding test have final dimensions of about 3.2 mm diameter and        6-8 mm length, on which one end of the rod was sandblasted,        cleaned and then silane treated as per the product instructions.        The treated end contacts the bonding cement as in a tooth        restoration. Each test group contains 5 samples.    -   2. Teeth samples were prepared to expose the dentin and then the        teeth were mounted with an acrylic material leaving the dentin        exposed, which were then subject to sand paper grinding under        wet condition to have a same surface pattern for all the test        groups.    -   3. The base paste and catalyst past of each cement material were        mixed in equal amounts and applied onto the prepared, briefly        dried tooth surface. The ceramic rod was then seated onto the        cement surface under a 500 gram load with the aid of a BenCor        Multi-test device (Danville Engineering, CA).    -   4. After the cement hardened, the bonded samples were        transferred into a 100% humidity chamber held at 37° C. for 24        hours before the debond test.

5. The debond test was accomplished in push shear mode using a BenCortesting device on an ATS testing machine. The load at which the bondedceramic rod broke was recorded and the shear bonding strength of thetesting sample was then calculated based on the rod surface area.Standard deviation is reported in parentheses. TABLE 3 Example 2 Example3 Example 4 Example 5 Example 6 Components Base Catalyst Base CatalystBase Catalyst Base Catalyst Base Catalyst Base resin mix 32.6 — 32.6 —32.6 — 32.6 — 32.6 — Catalyst resin mix — 45.0 — 45.0 — 45.0 — 45.0 —45.0 BiOCl — 46.5 — 46.5 — 46.5 — 46.5 — 46.5 Fumed silica 0.4 0.5 0.40.5 0.4 0.5 0.4 0.5 0.4 0.5 B467 55.0 — 55.0 — 55.0 — 55.0 — 55.0 —Glass ionomer 12.0 — 12.0 — 12.0 — 12.0 — 12.0 — SBS (MPa) 21.9 (5.1)15.3 (0.9 20.3 (3.7) 8.6 (1.9) 9.8 (0.6)

As a comparison, the cement formula containing an unsaturated phosphoricacid resin disclosed in U.S. Pat. No. 6,730,715 to Jia was used as acomparison. The dentin bonding strength of the comparison materialtested according to the method described above for examples 7-11 is inthe range of 3 to 8 MPa, while the present cement compositionscontaining 4-MET/4-META have significantly greater bonding strengths.

Examples 7-9 Determination of Shear Bonding Strength to Other DentalMaterials

The Shear bonding strength of the compositions of Examples 3-5 to othersubstrates was also determined using the same procedure described above.The other dental restorative material substrates tested includeRexillium® III, a nickel chromium base alloy for dental bridge framework(Pentron); Sculpture™ Plus Crown and Bridge indirect composite material(Pentron Corp.); and ZrO₂ and Al₂O₃ dental ceramics. TABLE 4 ExamplesExample 7 Example 8 Example 9 Cement material Base and Base and Base andcatalyst catalyst catalyst paste of paste of paste of Example 3 Example4 Example 5 SBS (MPa, S.D.) Rx III 19.3 (4.8) 25.4 (6.3) 13.2 (2.1)Sculpture Plus 12.2 (2.4) 22.4 (3.1) 18.5 (1.9) ZrO₂ Ceramics 14.7 (1.6)18.6 (2.6) 17.2 (3.0) Al₂O₃ Ceramics 13.2 (2.1) 12.5 (4.6) 11.8 (1.7)

Examples 10 and 10A-10G One-Component Bonding Formulations withoutFiller

One-component light curable compositions containing 4-MET/4-METAsuitable for bonding to tooth substrates without additional toothsurface treatment prior to the bonding were also prepared. Thesecompositions were prepared without filler. The tooth bonding tests wereperformed on Examples 10A to 10G as described in U.S. PublishedApplication, 2006/0084717 to Cohen et al., using an Ultradent jig(UltraDent, Utah), except that there is no prior etching procedure or asecond self-etching primer used on the tooth surface before applying thepresent one-component bonding formulations. The bonding results aresurprisingly exceptional, and they are comparable to the values achievedfrom those multi-stepped bonding systems described in U.S. PublishedApplication, 2006/0084717. In contrast, however, such results can beachieved with a simple application rather than using a multi-stepprocess. TABLE 5 Component Ex. 10 10A 10B 10C 10D 10E 10F 10G 4 META(4-MET) 38 38 38 38 38 50 45 45 UDMA 31 15 27 31 40 20 18 22.5 HEMA 3147 35 31 22 30 27 17.5 TEGDMA — — — — — — 10 15 BHT 0.02 0.02 0.02 0.020.02 0.02 0.02 0.02 Camphorquinone 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 EDMAB0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Lucirin TPO 0.5 0.5 0.5 0.5 0.5 0.5 0.50.5 SBS, Mpa (S.D.) — 16.4 19.7 22.5 24.8 9.0 22.7 21.2 to Dentin (3.1)(4.8) (3.5) (6.7) (1.8) (3.0) (4.4) SBS, Mpa (S.D.) — — 10.3 15.7 10.3 —15.1 to Enamel (1.6) (5.2) (2.3) (4.1)

Examples 11-18 One-Component Formulations with Filler

One-component light curable compositions containing 4-MET/4-METAsuitable for bonding to tooth substrates without additional toothsurface treatment prior to the bonding were also prepared. Thesecompositions were prepared with filler. The resins used in thecompositions were Examples 10A-10E. The relative amounts of resin andfiller are shown in Table 6. The tooth bonding tests were performed asdescribed above, using an Ultradent jig (UltraDent, Utah). Again,bonding results are very good. TABLE 6 Total filler Resin and SBS,dentin SBS, enamel Ex. content, content, substrate, MPa substrate, MPaNo. wt. % wt. % R 7200 B467 (S.D.) (S.D.) 11 45 10C, 55 1.1 43.9 29.0(4.5) — 12 45 10D, 55 1.1 43.9 26.5 (4.0) — 13 45 10E, 55 1.1 43.9  9.3(3.2) — 14 63.2 10A, 36 1.2 62 25.0 (2.5) — 15 63.2 10B, 36 1.2 62 29.7(6.4) 16.4 (4.1) 16 63.2 10C, 36 1.2 62 29.9 (8.9) 25.1 (4.4) 17 63.210D, 36 1.2 62 18.1 (4.7) — 18 71 10C, 29 0.6 70.4 28.6 (6.1) —

As can be seen in those examples, one-component resin compositionscontaining 4-META (4-MET) in the range of about 20-60 weight percent inthe polymerizable resin composition with or without fillers can be usedfor direct tooth substrate bonding without the use of any additionaletching or conditioning treatment prior to the bonding procedure.

The terms “a” and “an” do not denote a limitation of quantity, butrather denote the presence of at least one of the referenced item. Theendpoints of all ranges directed to the same component or property areinclusive and independently combinable. All references are incorporatedby referenced herein.

While the invention has been described with reference to exemplaryembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the invention. Inaddition, many modifications may be made to adapt a particular situationor material to the teachings of the invention without departing from theessential scope thereof. Therefore, it is intended that the inventionnot be limited to the particular embodiment disclosed as the best modecontemplated for carrying out this invention, but that the inventionwill include all embodiments falling within the scope of the appendedembodiments.

1. A self-etching and bonding dental resin composition comprising incombination about 20 to about 60 weight percent of a polymerizable(meth)acrylate carboxylic acid/anhydride, based on the total weight ofthe polymerizable components in the composition; a copolymerizablemulti-functional (meth)acrylate resin; a copolymerizable diluentmonomer; and a curing system.
 2. The composition of claim 1, wherein thepolymerizable (meth)acrylate carboxylic acid/anhydride is a compoundaccording to structure (I):

wherein n is 0, 1, 2, 3, or 4; q is 1, 2, 3, or 4; A is an anhydridegroup; a is 0 or 1, with the proviso that a and n are not both 0; R¹,R², R³, and R⁴ are each independently hydrogen, hydroxy, C₁-C₁₂ alkyl,C₁-C₁₂ perhaloalkyl, C₁-C₁₂ alkoxy, C₁-C₁₂ perhaloalkoxy, C₂-C₁₂alkenyl, C₂-C₁₂ alkynyl, (C₁-C₆ alkyl)-O—(C₁-C₆ alkylene), orhydroxy(C₁-C₆ alkylene); x and y are each independently an integer from1 to 10; R⁵ is a hydrogen or methyl group; M is

wherein G and J are each independently oxygen or NR⁶, wherein R⁶ ishydrogen or C₁-C₆ alkyl; m is 0, 1, or 2; and W is an aromatic oraliphatic hydrocarbyl linking group having a valency corresponding toz+1; and z is 1, 2, 3, 4, or
 5. 3. The composition of claim 1, whereinthe polymerizable (meth)acrylate carboxylic acid/anhydride is a compoundaccording to structure (II):

wherein n is 0, 1, 2, 3, or 4; A is an anhydride group; a is 0 or 1,with the proviso that a and n are not both 0; p is 1, 2, 3, or 4; R⁵ isa hydrogen or methyl group; R⁷ and R⁸ are each independently hydrogen,hydroxy, C₁-C₁₂ alkyl, C₁-C₁₂ perhaloalkyl, C₁-C₁₂ alkoxy, C₁-C₁₂perhaloalkoxy, C₂-C₁₂ alkenyl, C₂-C₁₂ alkynyl, (C₁-C₆ allyl)-O—(C₁-C₆allylene), or hydroxy(C₁-C₆ allylene); and d is 1 to
 10. 4. Thecomposition of claim 1, wherein the polymerizable (meth)acrylatecarboxylic acid/anhydride is 1,4-dimethacryloyloxyethylpyromelliticacid; 1,4-diacryloyloxyethylpyromellitic acid;4-(meth)acryloyloxymethyltrimellitic acid;4-(meth)acryloyloxymethyltrimellitic acid anhydride;4-acryloyloxymethyltrimellitic acid; 4-acryloyloxymethyltrimellitic acidanhydride; 4-methacryloyloxyethyltrimellitic acid;4-methacryloyloxyethyltrimellitic acid anhydride;4-acryloyloxyethyltrimellitic acid; 4-acryloyloxyethyltrimellitic acidanhydride; 4-(2-hydroxy-3-(meth)acryloyloxy)butyltrimellitic acid;4-(2-hydroxy-3-(meth)acryloyloxy)butyltrimellitic acid anhydride;4-(2-hydroxy-3-acryloyloxy)butyltrimellitic acid;4-(2-hydroxy-3-acryloyloxy)butyltrimellitic acid anhydride; an adduct of2-hydroxyethyl methacrylate with pyromellitic dianhydride; an adduct of2-hydroxyethyl acrylate with pyromellitic dianhydride; the reactionproduct of 2-hydroxyethylmethacrylate with ethylene glycolbistrimellitate dianhydride; the reaction product of2-hydroxyethylacrylate with ethylene glycol bistrimellitate dianhydride;the adduct of pyromellitic dianhydride with glycerol dimethacrylate; theadduct of pyromellitic dianhydride with glycerol diacrylate; or acombination comprising at least one of the foregoing.
 5. The compositionof claim 1, wherein the copolymerizable multi-functional (meth)acrylateresin is a urethane (meth)acrylate, a urethane di(meth)acrylate; apolyurethane (meth)acrylate; a diurethane dimethacrylate; apolycarbonate di(meth)acrylate; an ethoxylated bisphenol Adi(meth)acrylate; an ethoxylated trimethylolpropane tri(meth)acrylate; adiglycidyl (meth)acrylate adduct of Bisphenol A; or a combinationcomprising at least one of the foregoing.
 6. The composition of claim 1,wherein the copolymerizable multi-functional (meth)acrylate resin is a2,2′-bis[4-(3-methacryloxy-2-hydroxy propoxy)-phenyl]-propane or aurethane di(meth)acrylate.
 7. The composition of claim 1, wherein thecopolymerizable multi-functional (meth)acrylate resin is a present in anamount of about 10 to about 40 weight percent based on the total weightof the polymerizable components.
 8. The composition of claim 1, whereinthe diluent is a hydroxyalkyl(meth)acrylate; an ethylene glycol mono- ordi(meth)acrylate having one, two, three, or four repeat glycol units; a1,2- or 1,3-propylene glycol mono- or di(meth)acrylate having one, two,three, or four glycol repeat units; a C₄-C₁₂ diol di(meth)acrylate; aglycerol mono- or di(meth)acrylate; a trimethylolpropane mono-, di, ortri(meth)acrylate; a pentaerythritol mono-, di, or tri(meth)acrylate; aphenyl glycidyl ether (meth)acrylate; or a combination comprising atleast one of the foregoing.
 9. The composition of claim 1, wherein thediluent is 2-hydroxyethyl acrylate; 2-hydroxyethyl methacrylate;2-hydroxypropyl acrylate; 2-hydroxypropyl methacrylate; 4-hydroxybutylacrylate; 4-hydroxybutyl methacrylate; ethylene glycol acrylate;ethylene glycol methacrylate; diethylene glycol acrylate; diethyleneglycol methacrylate; tri(ethylene glycol) diacrylate; tri(ethyleneglycol) dimethacrylate; tetra(ethylene glycol) diacrylate;tetra(ethylene glycol) dimethacrylate; 1,2- or 1,3-propylene glycolacrylate; 1,2- or 1,3-propylene glycol methacrylate; dipropylene glycolacrylate; dipropylene glycol methacrylate; tri(propylene glycol)diacrylate; tri(propylene glycol) dimethacrylate; tetra(propyleneglycol) diacrylate; tetra(propylene glycol) dimethacrylate;1,4-butanediol diacrylate; 1,4-butanediol dimethacrylate; 1,6-hexanedioldiacrylate; 1,6-hexanediol dimethacrylate; or a combination comprisingat least one of the foregoing.
 10. The composition of claim 1, whereinthe diluent is present in an amount of about 15 to about 55 weightpercent, based on the total weight of the polymerizable components. 11.The composition of claim 1, wherein the cure system is a light-initiatedcure system.
 12. The composition of claim 1, further comprising, basedon the total weight of the composition, about 10 to about 90 weightpercent a particulate filler composition.
 13. The composition of claim12, wherein the filler is silica, fumed silica, quartz, strontiumsilicate, strontium borosilicate, lithium silicate, lithium aluminasilicate, amorphous silica, ammoniated or deammoniated calciumphosphate, tricalcium phosphate alumina, zirconia, tin oxide, titania,barium borosilicate glass filler, glass ionomer filler, silica glassfiller, calcium silicate, bismuth oxide, bismuth oxychloride, zirconiumoxide, barium sulfate, bismuth subcarbonate, or a combination comprisingat least one of the foregoing fillers.
 14. A dental restorationcomprising the cured composition of claim
 1. 15. A method of restoring atooth, comprising: mixing the first paste and the second paste of claim1 to form a self-etching and bonding dental resin cement composition;applying the self-etching and bonding dental resin composition to atooth surface or a surface of a dental restoration being bonded;applying the dental restorative material; and curing the composition.16. The method of claim 15, wherein the curing is by exposure to actinicradiation.